San Pablo Ridge is a small mountain range

Mountain range

A mountain range is a single, large mass consisting of a succession of mountains or narrowly spaced mountain ridges, with or without peaks, closely related in position, direction, formation, and age; a component part of a mountain system or of a mountain chain...

 in western Contra Costa County

Contra Costa County, California

Contra Costa County is a primarily suburban county in the San Francisco Bay Area of the U.S. state of California. As of the 2010 census, it had a population of 1,049,025...

 from Pinole

Pinole, California

Pinole is a city in Contra Costa County, California, United States. The population was 18,390 at the 2010 census. It is one of many small “bedroom communities” along the I-80 corridor in Western Contra Costa County. It is located about northeast of San Francisco, and approximately a half-hour...

 to Orinda

Orinda, California

-2010:The 2010 United States Census reported that Orinda had a population of 17,643. The population density was 1,389.5 people per square mile . The racial makeup of Orinda was 14,533 White, 149 African American, 22 Native American, 2,016 Asian, 24 Pacific Islander, 122 from other races, and...

 between Wildcat Canyon

Wildcat Canyon

Wildcat Canyon is a narrow linear valley just east of the Berkeley Hills in the San Francisco Bay Area, situated in Contra Costa County, California. The canyon is bounded on its east side by the San Pablo Ridge, and is drained by Wildcat Creek which runs northwest to its outlet in San Pablo Bay. ...

 and San Pablo Canyon. The western flank is part of the Wildcat Creek

Wildcat Creek

Wildcat Creek may refer to:* Wildcat Creek * Wildcat Creek * Wildcat Creek * Wildcat Creek...

 watershed

Drainage basin

A drainage basin is an extent or an area of land where surface water from rain and melting snow or ice converges to a single point, usually the exit of the basin, where the waters join another waterbody, such as a river, lake, reservoir, estuary, wetland, sea, or ocean...

 and the eastern flank is part of the San Pablo Creek

San Pablo Creek

San Pablo Creek is an creek in Contra Costa County, California, United States, which drains the canyon or valley between the San Pablo Ridge and the Sobrante Ridge, parts of the Pacific Coast Ranges east of San Francisco Bay....

 watershed. It is used by ranches for cattle-raising, is largely undeveloped, forming part of county lands and open space. It is adjacent to the Berkeley Hills

Berkeley Hills

The Berkeley Hills are a range of the Pacific Coast Ranges that overlook the northeast side of the valley that surrounds San Francisco Bay. They were previously called the "Contra Costa Range/Hills" , but with the establishment of Berkeley and the University of California, the current usage was...

 which are part of Wildcat Canyon Regional Park

Wildcat Canyon Regional Park

Wildcat Canyon Regional Park is a East Bay Regional Parks District park located within the city limits of Richmond in Contra Costa County in the San Francisco Bay Area of California...

.